[PATCH] libata: use preallocated buffers

It's not a very good idea to allocate memory during EH.  Use
statically allocated buffer for dev->id[] and add 512byte buffer
ap->sector_buf.  This buffer is owned by EH (or probing) and to be
used as temporary buffer for various purposes (IDENTIFY, NCQ log page
10h, PM GSCR block).

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 220b9d7bfc28..0e1a3be39475 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -360,7 +360,7 @@ struct ata_device {
         unsigned long           flags;          /* ATA_DFLAG_xxx */
         unsigned int            class;          /* ATA_DEV_xxx */
         unsigned int            devno;          /* 0 or 1 */
-        u16                     *id;            /* IDENTIFY xxx DEVICE data */
+        u16                     id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
         u8                      pio_mode;
         u8                      dma_mode;
         u8                      xfer_mode;
@@ -425,6 +425,8 @@ struct ata_port {
         struct list_head        eh_done_q;
 
         void                    *private_data;
+
+        u8                      sector_buf[ATA_SECT_SIZE]; /* owned by EH */
 };
 
 struct ata_port_operations {