Re: [patch] cxlflash: shift wrapping bug in afu_link_reset()
> On Aug 18, 2015, at 3:57 AM, Dan Carpenter wrote:
>
> "port_sel" is a u64 so the shifting should also be a 64 bit shift.
>
> Fixes: c21e0bbfc485 ('cxlflash: Base support for IBM CXL Flash Adapter')
> Signed-off-by: Dan Carpenter
>
> diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
> index 0720d2f..f97421d 100644
> --- a/drivers/scsi/cxlflash/main.c
> +++ b/drivers/scsi/cxlflash/main.c
> @@ -1179,7 +1179,7 @@ static void afu_link_reset(struct afu *afu, int port,
> u64 *fc_regs)
>
> /* first switch the AFU to the other links, if any */
> port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel);
> - port_sel &= ~(1 << port);
> + port_sel &= ~(1ULL << port);
> writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
> cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
>
> @@ -1196,7 +1196,7 @@ static void afu_link_reset(struct afu *afu, int port,
> u64 *fc_regs)
> __func__, port);
>
> /* switch back to include this port */
> - port_sel |= (1 << port);
> + port_sel |= (1ULL << port);
> writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
> cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
>
Acked-by: Matthew R. Ochs
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Re: [patch] cxlflash: shift wrapping bug in afu_link_reset()
Dan Carpenter writes:
> "port_sel" is a u64 so the shifting should also be a 64 bit shift.
>
> Fixes: c21e0bbfc485 ('cxlflash: Base support for IBM CXL Flash Adapter')
> Signed-off-by: Dan Carpenter
>
> diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
> index 0720d2f..f97421d 100644
> --- a/drivers/scsi/cxlflash/main.c
> +++ b/drivers/scsi/cxlflash/main.c
> @@ -1179,7 +1179,7 @@ static void afu_link_reset(struct afu *afu, int port,
> u64 *fc_regs)
>
> /* first switch the AFU to the other links, if any */
> port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel);
> - port_sel &= ~(1 << port);
> + port_sel &= ~(1ULL << port);
> writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
> cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
>
> @@ -1196,7 +1196,7 @@ static void afu_link_reset(struct afu *afu, int port,
> u64 *fc_regs)
> __func__, port);
>
> /* switch back to include this port */
> - port_sel |= (1 << port);
> + port_sel |= (1ULL << port);
> writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
> cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
>
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Reviewed-by: Johannes Thumshirn
--
Johannes Thumshirn Storage
jthumsh...@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
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[patch] cxlflash: shift wrapping bug in afu_link_reset()
"port_sel" is a u64 so the shifting should also be a 64 bit shift.
Fixes: c21e0bbfc485 ('cxlflash: Base support for IBM CXL Flash Adapter')
Signed-off-by: Dan Carpenter
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 0720d2f..f97421d 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -1179,7 +1179,7 @@ static void afu_link_reset(struct afu *afu, int port, u64
*fc_regs)
/* first switch the AFU to the other links, if any */
port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel);
- port_sel &= ~(1 << port);
+ port_sel &= ~(1ULL << port);
writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
@@ -1196,7 +1196,7 @@ static void afu_link_reset(struct afu *afu, int port, u64
*fc_regs)
__func__, port);
/* switch back to include this port */
- port_sel |= (1 << port);
+ port_sel |= (1ULL << port);
writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
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