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authorJon Burgess <jburgess777@googlemail.com>2007-05-03 12:23:44 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-05-09 10:12:42 -0300
commit87c3019d7b1acb7704a257d78c482112e9b0c227 (patch)
tree312478a0bed426b3ca89bf4fae1880fed9986bd2 /drivers/media
parent32a1db42480dc972e8e92be68d9e604f6aff5381 (diff)
V4L/DVB (5592): DMA: Correctly free resources on error, sync PCI streamed data
I added saa7146_vmalloc_destroy_pgtable() which frees the resources allocated by saa7146_vmalloc_build_pgtable() and updated the callers in budget-core.c and av7110.c. I have also been through the updated functions and updated the error paths to ensure they free all allocated resources on error. I also realised that there are other callers to saa7146_pgtable_free() which did not have any sg DMA mapped so it seems wrong to add the pci_unmap_sg() into that function. Instead I created saa7146_vmalloc_destroy_pgtable() to do this. Also included in this patch are the previous fixes for pci_unmap_sg() and syncing the PCI streamed data to work with a SWIOTLB and match the requirements documented in DMA-API.txt. Signed-off-by: Jon Burgess <jburgess777@googlemail.com> Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/common/saa7146_core.c54
-rw-r--r--drivers/media/dvb/ttpci/av7110.c9
-rw-r--r--drivers/media/dvb/ttpci/budget-core.c37
3 files changed, 61 insertions, 39 deletions
diff --git a/drivers/media/common/saa7146_core.c b/drivers/media/common/saa7146_core.c
index 86cbdbcf9d7d..ef3e54cd9407 100644
--- a/drivers/media/common/saa7146_core.c
+++ b/drivers/media/common/saa7146_core.c
@@ -136,28 +136,45 @@ char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa
char *mem = vmalloc_32(length);
int slen = 0;
- if (NULL == mem) {
- return NULL;
- }
+ if (NULL == mem)
+ goto err_null;
- if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
- vfree(mem);
- return NULL;
- }
+ if (!(pt->slist = vmalloc_to_sg(mem, pages)))
+ goto err_free_mem;
- if (saa7146_pgtable_alloc(pci, pt)) {
- kfree(pt->slist);
- pt->slist = NULL;
- vfree(mem);
- return NULL;
- }
+ if (saa7146_pgtable_alloc(pci, pt))
+ goto err_free_slist;
- slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
- if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
- return NULL;
- }
+ pt->nents = pages;
+ slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
+ if (0 == slen)
+ goto err_free_pgtable;
+
+ if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
+ goto err_unmap_sg;
return mem;
+
+err_unmap_sg:
+ pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
+err_free_pgtable:
+ saa7146_pgtable_free(pci, pt);
+err_free_slist:
+ kfree(pt->slist);
+ pt->slist = NULL;
+err_free_mem:
+ vfree(mem);
+err_null:
+ return NULL;
+}
+
+void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, char *mem, struct saa7146_pgtable *pt)
+{
+ pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
+ saa7146_pgtable_free(pci, pt);
+ kfree(pt->slist);
+ pt->slist = NULL;
+ vfree(mem);
}
void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
@@ -166,8 +183,6 @@ void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
return;
pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
pt->cpu = NULL;
- kfree(pt->slist);
- pt->slist = NULL;
}
int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
@@ -528,6 +543,7 @@ EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
+EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
EXPORT_SYMBOL_GPL(saa7146_setgpio);
diff --git a/drivers/media/dvb/ttpci/av7110.c b/drivers/media/dvb/ttpci/av7110.c
index 67becdd4db60..ef1108c0bf11 100644
--- a/drivers/media/dvb/ttpci/av7110.c
+++ b/drivers/media/dvb/ttpci/av7110.c
@@ -1246,6 +1246,9 @@ static void vpeirq(unsigned long data)
if (!budget->feeding1 || (newdma == olddma))
return;
+ /* Ensure streamed PCI data is synced to CPU */
+ pci_dma_sync_sg_for_cpu(budget->dev->pci, budget->pt.slist, budget->pt.nents, PCI_DMA_FROMDEVICE);
+
#if 0
/* track rps1 activity */
printk("vpeirq: %02x Event Counter 1 0x%04x\n",
@@ -2679,8 +2682,8 @@ err_iobuf_vfree_6:
err_pci_free_5:
pci_free_consistent(pdev, 8192, av7110->debi_virt, av7110->debi_bus);
err_saa71466_vfree_4:
- if (!av7110->grabbing)
- saa7146_pgtable_free(pdev, &av7110->pt);
+ if (av7110->grabbing)
+ saa7146_vfree_destroy_pgtable(pdev, av7110->grabbing, &av7110->pt);
err_i2c_del_3:
i2c_del_adapter(&av7110->i2c_adap);
err_dvb_unregister_adapter_2:
@@ -2710,7 +2713,7 @@ static int __devexit av7110_detach(struct saa7146_dev* saa)
SAA7146_ISR_CLEAR(saa, MASK_10);
msleep(50);
tasklet_kill(&av7110->vpe_tasklet);
- saa7146_pgtable_free(saa->pci, &av7110->pt);
+ saa7146_vfree_destroy_pgtable(saa->pci, av7110->grabbing, &av7110->pt);
}
av7110_exit_v4l(av7110);
diff --git a/drivers/media/dvb/ttpci/budget-core.c b/drivers/media/dvb/ttpci/budget-core.c
index 6b97dc1e6b65..2557ac9620d0 100644
--- a/drivers/media/dvb/ttpci/budget-core.c
+++ b/drivers/media/dvb/ttpci/budget-core.c
@@ -195,6 +195,9 @@ static void vpeirq(unsigned long data)
u32 newdma = saa7146_read(budget->dev, PCI_VDP3);
u32 count;
+ /* Ensure streamed PCI data is synced to CPU */
+ pci_dma_sync_sg_for_cpu(budget->dev->pci, budget->pt.slist, budget->pt.nents, PCI_DMA_FROMDEVICE);
+
/* nearest lower position divisible by 188 */
newdma -= newdma % 188;
@@ -504,16 +507,16 @@ int ttpci_budget_init(struct budget *budget, struct saa7146_dev *dev,
strcpy(budget->i2c_adap.name, budget->card->name);
if (i2c_add_adapter(&budget->i2c_adap) < 0) {
- dvb_unregister_adapter(&budget->dvb_adapter);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_dvb_unregister;
}
ttpci_eeprom_parse_mac(&budget->i2c_adap, budget->dvb_adapter.proposed_mac);
- if (NULL ==
- (budget->grabbing = saa7146_vmalloc_build_pgtable(dev->pci, budget->buffer_size, &budget->pt))) {
+ budget->grabbing = saa7146_vmalloc_build_pgtable(dev->pci, budget->buffer_size, &budget->pt);
+ if (NULL == budget->grabbing) {
ret = -ENOMEM;
- goto err;
+ goto err_del_i2c;
}
saa7146_write(dev, PCI_BT_V1, 0x001c0000);
@@ -526,14 +529,16 @@ int ttpci_budget_init(struct budget *budget, struct saa7146_dev *dev,
if (bi->type != BUDGET_FS_ACTIVY)
saa7146_setgpio(dev, 2, SAA7146_GPIO_OUTHI);
- if (budget_register(budget) == 0) {
- return 0;
- }
-err:
- i2c_del_adapter(&budget->i2c_adap);
+ if (budget_register(budget) == 0)
+ return 0; /* Everything OK */
+
+ /* An error occurred, cleanup resources */
+ saa7146_vfree_destroy_pgtable(dev->pci, budget->grabbing, &budget->pt);
- vfree(budget->grabbing);
+err_del_i2c:
+ i2c_del_adapter(&budget->i2c_adap);
+err_dvb_unregister:
dvb_unregister_adapter(&budget->dvb_adapter);
return ret;
@@ -555,15 +560,13 @@ int ttpci_budget_deinit(struct budget *budget)
budget_unregister(budget);
- i2c_del_adapter(&budget->i2c_adap);
-
- dvb_unregister_adapter(&budget->dvb_adapter);
-
tasklet_kill(&budget->vpe_tasklet);
- saa7146_pgtable_free(dev->pci, &budget->pt);
+ saa7146_vfree_destroy_pgtable(dev->pci, budget->grabbing, &budget->pt);
- vfree(budget->grabbing);
+ i2c_del_adapter(&budget->i2c_adap);
+
+ dvb_unregister_adapter(&budget->dvb_adapter);
return 0;
}

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