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[efi] Raise TPL when calling UNDI entry point 

The SnpDxe driver raises the task priority level to TPL_CALLBACK when
calling the UNDI entry point.  This does not appear to be a documented
requirement, but we should probably match the behaviour of SnpDxe to
minimise surprises to third party code.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2017-09-05 10:48:41 +01:00
parent 306465bef3
commit 3ae70be5ba
1 changed files with 8 additions and 0 deletions
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8
src/drivers/net/efi/nii.c
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@ -402,7 +402,9 @@ static EFIAPI VOID nii_block ( UINT64 unique_id, UINT32 acquire ) {
*/
static int nii_issue_cpb_db ( struct nii_nic *nii, unsigned int op, void *cpb,
size_t cpb_len, void *db, size_t db_len ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
PXE_CDB cdb;
UINTN tpl;
/* Prepare command descriptor block */
memset ( &cdb, 0, sizeof ( cdb ) );
@ -414,6 +416,9 @@ static int nii_issue_cpb_db ( struct nii_nic *nii, unsigned int op, void *cpb,
cdb.DBsize = db_len;
cdb.IFnum = nii->nii->IfNum;
/* Raise task priority level */
tpl = bs->RaiseTPL ( TPL_CALLBACK );
/* Issue command */
DBGC2 ( nii, "NII %s issuing %02x:%04x ifnum %d%s%s\n",
nii->dev.name, cdb.OpCode, cdb.OpFlags, cdb.IFnum,
@ -424,6 +429,9 @@ static int nii_issue_cpb_db ( struct nii_nic *nii, unsigned int op, void *cpb,
DBGC2_HD ( nii, db, db_len );
nii->issue ( ( intptr_t ) &cdb );
/* Restore task priority level */
bs->RestoreTPL ( tpl );
/* Check completion status */
if ( cdb.StatCode != PXE_STATCODE_SUCCESS )
return -cdb.StatCode;