Messages in this thread Patch in this message | | | Date | Mon, 22 Sep 2003 10:31:23 -0700 | From | Dave Olien <> | Subject | [PATCH] DAC960, remove redundant (and uninitialized) PciDevice pointer. |
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this patch fixes a bug that appeared only on Alpha hardware with DAC960 controllers. The Command->PciDevice structure member was never initialized. This was passed to the pci scatter/gather functions. This didn't cause a problem for x86 platforms because the scatter/gather funtions never really used that information. Alpha platforms do use that pointer.
The Command->PciDevice field was also redundant with the Controller->PCIDevice field, which IS initialized properly. So, eliminating the redundant structure member and substituting the Controller's member fixes the bug.
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diff -ur linux-2.6.0-test5-mm4_original/drivers/block/DAC960.c linux-2.6.0-test5-mm4_DAC/drivers/block/DAC960.c --- linux-2.6.0-test5-mm4_original/drivers/block/DAC960.c 2003-09-22 10:11:29.000000000 -0700 +++ linux-2.6.0-test5-mm4_DAC/drivers/block/DAC960.c 2003-09-22 10:20:35.000000000 -0700 @@ -3300,7 +3300,7 @@ Command->SegmentCount = blk_rq_map_sg(Controller->RequestQueue, Command->Request, Command->cmd_sglist); /* pci_map_sg MAY change the value of SegCount */ - Command->SegmentCount = pci_map_sg(Command->PciDevice, Command->cmd_sglist, + Command->SegmentCount = pci_map_sg(Controller->PCIDevice, Command->cmd_sglist, Command->SegmentCount, Command->DmaDirection); DAC960_QueueReadWriteCommand(Command); @@ -3336,7 +3336,7 @@ (void)blk_rq_map_sg(Controller->RequestQueue, Command->Request, Command->cmd_sglist); - (void)pci_map_sg(Command->PciDevice, Command->cmd_sglist, 1, + (void)pci_map_sg(Controller->PCIDevice, Command->cmd_sglist, 1, Command->DmaDirection); /* * Resubmitting the request sector at a time is really tedious. @@ -3377,7 +3377,7 @@ if (SuccessfulIO) UpToDate = 1; - pci_unmap_sg(Command->PciDevice, Command->cmd_sglist, + pci_unmap_sg(Command->Controller->PCIDevice, Command->cmd_sglist, Command->SegmentCount, Command->DmaDirection); if (!end_that_request_first(Request, UpToDate, Command->BlockCount)) { diff -ur linux-2.6.0-test5-mm4_original/drivers/block/DAC960.h linux-2.6.0-test5-mm4_DAC/drivers/block/DAC960.h --- linux-2.6.0-test5-mm4_original/drivers/block/DAC960.h 2003-09-08 12:50:21.000000000 -0700 +++ linux-2.6.0-test5-mm4_DAC/drivers/block/DAC960.h 2003-09-22 10:20:35.000000000 -0700 @@ -2248,7 +2248,6 @@ int DmaDirection; struct scatterlist *cmd_sglist; struct request *Request; - struct pci_dev *PciDevice; union { struct { DAC960_V1_CommandMailbox_T CommandMailbox; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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