[PATCH 2/2] mxcmmc: Internal error: Oops: 17 [#1] ARM from sg->offset
Function mxcmci_request() throw an exception on a imx27 cpu. This patch fix the problem by test the pointer before access it. [ 516.783407] Unable to handle kernel NULL pointer dereference at virtual address 0004 [ 516.791639] pgd = c0004000 [ 516.794445] [0004] *pgd= [ 516.798088] Internal error: Oops: 17 [#1] ARM [ 516.802472] Modules linked in: [ 516.805593] CPU: 0 PID: 569 Comm: mmcqd/0 Not tainted 3.13.0-rc1-next-20131125-6-g5f6bb77-dirty #66 [ 516.815027] task: cfb8a2a0 ti: cfb88000 task.ti: cfb88000 [ 516.820484] PC is at mxcmci_request+0xd0/0x2f8 [ 516.824974] LR is at mxcmci_request+0xf8/0x2f8 [ 516.829466] pc : []lr : []psr: 0013 [ 516.829466] sp : cfb89dd0 ip : cfb89dd0 fp : cfb89e1c [ 516.840988] r10: 01ff r9 : 0002 r8 : cfa10620 [ 516.846250] r7 : 0200 r6 : cfa0f02c r5 : cfa0f0ec r4 : cfa10400 [ 516.852812] r3 : a013 r2 : cfa0f410 r1 : 0004 r0 : [ 516.859376] Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel [ 516.866723] Control: 0005317f Table: afa74000 DAC: 0017 [ 516.872503] Process mmcqd/0 (pid: 569, stack limit = 0xcfb881c0) [ 516.878543] Stack: (0xcfb89dd0 to 0xcfb8a000) (gdb) list *(mxcmci_request+0xd0) 0xcac is at drivers/mmc/host/mxcmmc.c:350. 345 346if (!mxcmci_use_dma(host)) 347return 0; 348 349for_each_sg(data->sg, sg, data->sg_len, i) { 350if (sg->offset & 3 || sg->length & 3 || sg->length < 512) { 351host->do_dma = 0; 352return 0; 353} 354} Signed-off-by: Chris Ruehl --- drivers/mmc/host/mxcmmc.c |2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c index f7199c8..8645d6a 100644 --- a/drivers/mmc/host/mxcmmc.c +++ b/drivers/mmc/host/mxcmmc.c @@ -347,7 +347,7 @@ static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) return 0; for_each_sg(data->sg, sg, data->sg_len, i) { - if (sg->offset & 3 || sg->length & 3 || sg->length < 512) { + if (sg && (sg->offset & 3 || sg->length & 3 || sg->length < 512)) { host->do_dma = 0; return 0; } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 2/2] mxcmmc: Internal error: Oops: 17 [#1] ARM from sg-offset
Function mxcmci_request() throw an exception on a imx27 cpu. This patch fix the problem by test the pointer before access it. [ 516.783407] Unable to handle kernel NULL pointer dereference at virtual address 0004 [ 516.791639] pgd = c0004000 [ 516.794445] [0004] *pgd= [ 516.798088] Internal error: Oops: 17 [#1] ARM [ 516.802472] Modules linked in: [ 516.805593] CPU: 0 PID: 569 Comm: mmcqd/0 Not tainted 3.13.0-rc1-next-20131125-6-g5f6bb77-dirty #66 [ 516.815027] task: cfb8a2a0 ti: cfb88000 task.ti: cfb88000 [ 516.820484] PC is at mxcmci_request+0xd0/0x2f8 [ 516.824974] LR is at mxcmci_request+0xf8/0x2f8 [ 516.829466] pc : [c02b6048]lr : [c02b6070]psr: 0013 [ 516.829466] sp : cfb89dd0 ip : cfb89dd0 fp : cfb89e1c [ 516.840988] r10: 01ff r9 : 0002 r8 : cfa10620 [ 516.846250] r7 : 0200 r6 : cfa0f02c r5 : cfa0f0ec r4 : cfa10400 [ 516.852812] r3 : a013 r2 : cfa0f410 r1 : 0004 r0 : [ 516.859376] Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel [ 516.866723] Control: 0005317f Table: afa74000 DAC: 0017 [ 516.872503] Process mmcqd/0 (pid: 569, stack limit = 0xcfb881c0) [ 516.878543] Stack: (0xcfb89dd0 to 0xcfb8a000) (gdb) list *(mxcmci_request+0xd0) 0xcac is at drivers/mmc/host/mxcmmc.c:350. 345 346if (!mxcmci_use_dma(host)) 347return 0; 348 349for_each_sg(data-sg, sg, data-sg_len, i) { 350if (sg-offset 3 || sg-length 3 || sg-length 512) { 351host-do_dma = 0; 352return 0; 353} 354} Signed-off-by: Chris Ruehl chris.ru...@gtsys.com.hk --- drivers/mmc/host/mxcmmc.c |2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c index f7199c8..8645d6a 100644 --- a/drivers/mmc/host/mxcmmc.c +++ b/drivers/mmc/host/mxcmmc.c @@ -347,7 +347,7 @@ static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) return 0; for_each_sg(data-sg, sg, data-sg_len, i) { - if (sg-offset 3 || sg-length 3 || sg-length 512) { + if (sg (sg-offset 3 || sg-length 3 || sg-length 512)) { host-do_dma = 0; return 0; } -- 1.7.10.4 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/