diff options
| author | Samuel Holland <samuel@sholland.org> | 2021-04-28 02:59:13 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-05-16 01:01:33 +0300 |
| commit | 44c5027bb5c8bbdc2aea2141dc32fe72c3f3988a (patch) | |
| tree | 97cacee68418fb40a2b651470f43b2a5175d29f6 | |
| parent | 0edca4fc633ce223753c217f135a8036f516357b (diff) | |
| download | linux-44c5027bb5c8bbdc2aea2141dc32fe72c3f3988a.tar.xz | |
scsi: 3w-9xxx: Use flexible array members to avoid struct padding
In preparation for removing the "#pragma pack(1)" from the driver, fix all
instances where a trailing array member could be replaced by a flexible
array member. Since a flexible array member has zero size, it introduces no
padding, whether or not the struct is packed.
Link: https://lore.kernel.org/r/20210427235915.39211-2-samuel@sholland.org
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/3w-9xxx.c | 16 | ||||
| -rw-r--r-- | drivers/scsi/3w-9xxx.h | 4 |
2 files changed, 12 insertions, 8 deletions
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c index 47028f5e57ab..c91e20515767 100644 --- a/drivers/scsi/3w-9xxx.c +++ b/drivers/scsi/3w-9xxx.c @@ -676,7 +676,9 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long data_buffer_length_adjusted = (driver_command.buffer_length + 511) & ~511; /* Now allocate ioctl buf memory */ - cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, &dma_handle, GFP_KERNEL); + cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, + sizeof(TW_Ioctl_Buf_Apache) + data_buffer_length_adjusted, + &dma_handle, GFP_KERNEL); if (!cpu_addr) { retval = TW_IOCTL_ERROR_OS_ENOMEM; goto out2; @@ -685,7 +687,7 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long tw_ioctl = (TW_Ioctl_Buf_Apache *)cpu_addr; /* Now copy down the entire ioctl */ - if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache) - 1)) + if (copy_from_user(tw_ioctl, argp, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length)) goto out3; /* See which ioctl we are doing */ @@ -867,11 +869,13 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long } /* Now copy the entire response to userspace */ - if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length - 1) == 0) + if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length) == 0) retval = 0; out3: /* Now free ioctl buf memory */ - dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, cpu_addr, dma_handle); + dma_free_coherent(&tw_dev->tw_pci_dev->dev, + sizeof(TW_Ioctl_Buf_Apache) + data_buffer_length_adjusted, + cpu_addr, dma_handle); out2: mutex_unlock(&tw_dev->ioctl_lock); out: @@ -1392,7 +1396,7 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm newcommand->request_id__lunl = cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id)); if (length) { - newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1); + newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache)); newcommand->sg_list[0].length = cpu_to_le32(length); } newcommand->sgl_entries__lunh = @@ -1407,7 +1411,7 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm sgl = (TW_SG_Entry *)((u32 *)oldcommand+oldcommand->size - (sizeof(TW_SG_Entry)/4) + pae); else sgl = (TW_SG_Entry *)((u32 *)oldcommand+TW_SGL_OUT(oldcommand->opcode__sgloffset)); - sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1); + sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache)); sgl->length = cpu_to_le32(length); oldcommand->size += pae; diff --git a/drivers/scsi/3w-9xxx.h b/drivers/scsi/3w-9xxx.h index 30109ae96ce5..23b312a53eaf 100644 --- a/drivers/scsi/3w-9xxx.h +++ b/drivers/scsi/3w-9xxx.h @@ -602,7 +602,7 @@ typedef struct TAG_TW_Ioctl_Apache { TW_Ioctl_Driver_Command driver_command; char padding[488]; TW_Command_Full firmware_command; - char data_buffer[1]; + char data_buffer[]; } TW_Ioctl_Buf_Apache; /* Lock structure for ioctl get/release lock */ @@ -618,7 +618,7 @@ typedef struct { unsigned short parameter_id; unsigned short parameter_size_bytes; unsigned short actual_parameter_size_bytes; - unsigned char data[1]; + unsigned char data[]; } TW_Param_Apache, *PTW_Param_Apache; /* Response queue */ |