From ec448a0a361ce3fa97a32a5c267a680163ffe8c5 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 18 Apr 2006 09:05:39 -0700 Subject: [PATCH] [SCSI] srp.h: avoid padding of structs Several structs in get padded to a multiple of 8 bytes on 64-bit architectures and end up with a size that does not match the definition in the SRP spec: SRP spec 64-bit sizeof (struct indirect_buf) 20 24 sizeof (struct srp_login_rsp) 52 56 sizeof (struct srp_rsp) 36 40 Fix this by adding __attribute__((packed)) to the offending structs. Problem pointed out by Arne Redlich . Signed-off-by: Roland Dreier Signed-off-by: James Bottomley --- include/scsi/srp.h | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/include/scsi/srp.h b/include/scsi/srp.h index 6c2681dc5b46..637f77eccf0c 100644 --- a/include/scsi/srp.h +++ b/include/scsi/srp.h @@ -95,14 +95,15 @@ struct srp_direct_buf { /* * We need the packed attribute because the SRP spec puts the list of - * descriptors at an offset of 20, which is not aligned to the size - * of struct srp_direct_buf. + * descriptors at an offset of 20, which is not aligned to the size of + * struct srp_direct_buf. The whole structure must be packed to avoid + * having the 20-byte structure padded to 24 bytes on 64-bit architectures. */ struct srp_indirect_buf { struct srp_direct_buf table_desc; __be32 len; - struct srp_direct_buf desc_list[0] __attribute__((packed)); -}; + struct srp_direct_buf desc_list[0]; +} __attribute__((packed)); enum { SRP_MULTICHAN_SINGLE = 0, @@ -122,6 +123,11 @@ struct srp_login_req { u8 target_port_id[16]; }; +/* + * The SRP spec defines the size of the LOGIN_RSP structure to be 52 + * bytes, so it needs to be packed to avoid having it padded to 56 + * bytes on 64-bit architectures. + */ struct srp_login_rsp { u8 opcode; u8 reserved1[3]; @@ -132,7 +138,7 @@ struct srp_login_rsp { __be16 buf_fmt; u8 rsp_flags; u8 reserved2[25]; -}; +} __attribute__((packed)); struct srp_login_rej { u8 opcode; @@ -207,6 +213,11 @@ enum { SRP_RSP_FLAG_DIUNDER = 1 << 5 }; +/* + * The SRP spec defines the size of the RSP structure to be 36 bytes, + * so it needs to be packed to avoid having it padded to 40 bytes on + * 64-bit architectures. + */ struct srp_rsp { u8 opcode; u8 sol_not; @@ -221,6 +232,6 @@ struct srp_rsp { __be32 sense_data_len; __be32 resp_data_len; u8 data[0]; -}; +} __attribute__((packed)); #endif /* SCSI_SRP_H */ -- 2.39.5