From ce1fef0b7e749c71729bdacaa98708d9b65387a4 Mon Sep 17 00:00:00 2001 From: Oliver Endriss Date: Thu, 3 May 2007 17:23:44 +0200 Subject: saa7146: DMA: Correctly free resources on error, sync PCI streamed data From: Jon Burgess 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 Signed-off-by: Oliver Endriss --- linux/drivers/media/common/saa7146_core.c | 54 ++++++++++++++++++++----------- 1 file changed, 35 insertions(+), 19 deletions(-) (limited to 'linux/drivers/media/common/saa7146_core.c') diff --git a/linux/drivers/media/common/saa7146_core.c b/linux/drivers/media/common/saa7146_core.c index b13f2ade3..06edb5fc1 100644 --- a/linux/drivers/media/common/saa7146_core.c +++ b/linux/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) @@ -532,6 +547,7 @@ 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); -- cgit v1.2.3