Em 27-06-2012 06:07, Dan Carpenter escreveu:
> "pvt->ambase" is a u64 datatype. The intent here is to fill the first
> half in the first call to pci_read_config_dword() and the other half in
> the second. Unfortunately the pointer math is wrong so we set the wrong
> data.
Applied, thanks!
Mauro
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> v2: Redid it as with a union as Walter Harms suggested.
> Fixed the same bug in i5400_edac.c as well.
> v3: Make the struct __packed just in case.
>
> I don't have this hardware, so please review carefully. But the
> original code obviously corrupts memory so my patch could hardly be
> worse...
>
> This was originally sent on Mon, Mar 5, 2012. Btw, there are some
> Sparse errors in these files. The code looks buggy but I don't know
> what the intent was.
>
> drivers/edac/i5000_edac.c:485:15: warning: right shift by bigger than source value
> drivers/edac/i5000_edac.c:580:23: warning: right shift by bigger than source value
> drivers/edac/i5400_edac.c:391:36: warning: right shift by bigger than source value
> drivers/edac/i5400_edac.c:401:37: warning: right shift by bigger than source value
>
> diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
> index a5c33df..39c6375 100644
> --- a/drivers/edac/i5000_edac.c
> +++ b/drivers/edac/i5000_edac.c
> @@ -328,7 +328,13 @@ struct i5000_pvt {
> struct pci_dev *branch_1; /* 22.0 */
>
> u16 tolm; /* top of low memory */
> - u64 ambase; /* AMB BAR */
> + union {
> + u64 ambase; /* AMB BAR */
> + struct {
> + u32 ambase_bottom;
> + u32 ambase_top;
> + } u __packed;
> + };
>
> u16 mir0, mir1, mir2;
>
> @@ -1131,9 +1137,9 @@ static void i5000_get_mc_regs(struct mem_ctl_info *mci)
> pvt = mci->pvt_info;
>
> pci_read_config_dword(pvt->system_address, AMBASE,
> - (u32 *) & pvt->ambase);
> + &pvt->u.ambase_bottom);
> pci_read_config_dword(pvt->system_address, AMBASE + sizeof(u32),
> - ((u32 *) & pvt->ambase) + sizeof(u32));
> + &pvt->u.ambase_top);
>
> maxdimmperch = pvt->maxdimmperch;
> maxch = pvt->maxch;
> diff --git a/drivers/edac/i5400_edac.c b/drivers/edac/i5400_edac.c
> index 50069c6..2772469 100644
> --- a/drivers/edac/i5400_edac.c
> +++ b/drivers/edac/i5400_edac.c
> @@ -327,7 +327,13 @@ struct i5400_pvt {
> struct pci_dev *branch_1; /* 22.0 */
>
> u16 tolm; /* top of low memory */
> - u64 ambase; /* AMB BAR */
> + union {
> + u64 ambase; /* AMB BAR */
> + struct {
> + u32 ambase_bottom;
> + u32 ambase_top;
> + } u __packed;
> + };
>
> u16 mir0, mir1;
>
> @@ -1055,9 +1061,9 @@ static void i5400_get_mc_regs(struct mem_ctl_info *mci)
> pvt = mci->pvt_info;
>
> pci_read_config_dword(pvt->system_address, AMBASE,
> - (u32 *) &pvt->ambase);
> + &pvt->u.ambase_bottom);
> pci_read_config_dword(pvt->system_address, AMBASE + sizeof(u32),
> - ((u32 *) &pvt->ambase) + sizeof(u32));
> + &pvt->u.ambase_top);
>
> maxdimmperch = pvt->maxdimmperch;
> maxch = pvt->maxch;
>
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