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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Vladimir Serbinenko <phcoder@gmail.com>
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Date: Wed, 29 Jan 2014 23:49:51 +0100
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Subject: [PATCH] * grub-core/disk/ahci.c: Properly handle transactions with no
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transferred data.
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---
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grub-core/disk/ahci.c | 7 +++++--
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ChangeLog | 5 +++++
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2 files changed, 10 insertions(+), 2 deletions(-)
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diff --git a/grub-core/disk/ahci.c b/grub-core/disk/ahci.c
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index 643e691ef80..fdd40c64dd9 100644
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--- a/grub-core/disk/ahci.c
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+++ b/grub-core/disk/ahci.c
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@@ -932,7 +932,10 @@ grub_ahci_readwrite_real (struct grub_ahci_device *dev,
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if (parms->size > GRUB_AHCI_PRDT_MAX_CHUNK_LENGTH)
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return grub_error (GRUB_ERR_BUG, "too big data buffer");
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- bufc = grub_memalign_dma32 (1024, parms->size + (parms->size & 1));
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+ if (parms->size)
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+ bufc = grub_memalign_dma32 (1024, parms->size + (parms->size & 1));
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+ else
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+ bufc = grub_memalign_dma32 (1024, 512);
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grub_dprintf ("ahci", "AHCI tfd = %x, CL=%p\n",
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dev->hba->ports[dev->port].task_file_data,
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@@ -942,7 +945,7 @@ grub_ahci_readwrite_real (struct grub_ahci_device *dev,
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= (5 << GRUB_AHCI_CONFIG_CFIS_LENGTH_SHIFT)
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// | GRUB_AHCI_CONFIG_CLEAR_R_OK
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| (0 << GRUB_AHCI_CONFIG_PMP_SHIFT)
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- | (1 << GRUB_AHCI_CONFIG_PRDT_LENGTH_SHIFT)
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+ | ((parms->size ? 1 : 0) << GRUB_AHCI_CONFIG_PRDT_LENGTH_SHIFT)
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| (parms->cmdsize ? GRUB_AHCI_CONFIG_ATAPI : 0)
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| (parms->write ? GRUB_AHCI_CONFIG_WRITE : GRUB_AHCI_CONFIG_READ)
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| (parms->taskfile.cmd == 8 ? (1 << 8) : 0);
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diff --git a/ChangeLog b/ChangeLog
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index 15300b020c6..bc1ab231b02 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,8 @@
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+2014-01-29 Vladimir Serbinenko <phcoder@gmail.com>
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+
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+ * grub-core/disk/ahci.c: Properly handle transactions with no
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+ transferred data.
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+
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2014-01-29 Vladimir Serbinenko <phcoder@gmail.com>
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* grub-core/disk/ahci.c: Add safety cleanups.
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