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author | Jon Burgess <jburgess777@googlemail.com> | 2007-05-03 12:23:44 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-05-09 10:12:42 -0300 |
commit | 87c3019d7b1acb7704a257d78c482112e9b0c227 (patch) | |
tree | 312478a0bed426b3ca89bf4fae1880fed9986bd2 /drivers/media/common/saa7146_core.c | |
parent | 32a1db42480dc972e8e92be68d9e604f6aff5381 (diff) | |
download | linux-stable-87c3019d7b1acb7704a257d78c482112e9b0c227.tar.gz linux-stable-87c3019d7b1acb7704a257d78c482112e9b0c227.tar.bz2 linux-stable-87c3019d7b1acb7704a257d78c482112e9b0c227.zip |
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/common/saa7146_core.c')
-rw-r--r-- | drivers/media/common/saa7146_core.c | 54 |
1 files changed, 35 insertions, 19 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); |