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* grub-core/disk/ahci.c: Properly handle transactions with no

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transferred data.
This commit is contained in:
Vladimir Serbinenko 2014-01-29 23:49:51 +01:00
parent 07ea8daa86
commit d6b94c5eb2
2 changed files with 10 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2014-01-29 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/disk/ahci.c: Properly handle transactions with no
transferred data.
2014-01-29 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/disk/ahci.c: Add safety cleanups.

7
grub-core/disk/ahci.c
View file

@ -932,7 +932,10 @@ grub_ahci_readwrite_real (struct grub_ahci_device *dev,
if (parms->size > GRUB_AHCI_PRDT_MAX_CHUNK_LENGTH)
return grub_error (GRUB_ERR_BUG, "too big data buffer");
bufc = grub_memalign_dma32 (1024, parms->size + (parms->size & 1));
if (parms->size)
bufc = grub_memalign_dma32 (1024, parms->size + (parms->size & 1));
else
bufc = grub_memalign_dma32 (1024, 512);
grub_dprintf ("ahci", "AHCI tfd = %x, CL=%p\n",
dev->hba->ports[dev->port].task_file_data,
@ -942,7 +945,7 @@ grub_ahci_readwrite_real (struct grub_ahci_device *dev,
= (5 << GRUB_AHCI_CONFIG_CFIS_LENGTH_SHIFT)
// | GRUB_AHCI_CONFIG_CLEAR_R_OK
| (0 << GRUB_AHCI_CONFIG_PMP_SHIFT)
| (1 << GRUB_AHCI_CONFIG_PRDT_LENGTH_SHIFT)
| ((parms->size ? 1 : 0) << GRUB_AHCI_CONFIG_PRDT_LENGTH_SHIFT)
| (parms->cmdsize ? GRUB_AHCI_CONFIG_ATAPI : 0)
| (parms->write ? GRUB_AHCI_CONFIG_WRITE : GRUB_AHCI_CONFIG_READ)
| (parms->taskfile.cmd == 8 ? (1 << 8) : 0);