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ahci.c: mask unused flags when reading size PRDT DBC

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The data byte count(DBC) read from the description information is defined for
bits 21:00. Bits 30:22 are reserved and bit 31 is the Interrupt on Completion
(I) flag.

Completion interrupts are triggered after every transaction instead of on
I-flag in QEMU. tbl_entry_size is a signed integer and improperly reading the
DBC leads to a negative offset that causes sglist allocation to fail.

Signed-off-by: Reza Jelveh <reza.jelveh@tuhh.de>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Reza Jelveh 2014-07-01 13:13:27 +02:00 • committed by Stefan Hajnoczi
parent 37253e1ec8
commit d02f8adc6d
2 changed files with 10 additions and 3 deletions
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2
hw/ide/ahci.h
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@ -201,6 +201,8 @@
#define AHCI_COMMAND_TABLE_ACMD 0x40
#define AHCI_PRDT_SIZE_MASK 0x3fffff
#define IDE_FEATURE_DMA 1
#define READ_FPDMA_QUEUED 0x60