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[efi] Poll for TX completions only when there is an outstanding TX buffer

At least one NII implementation (in a Microsoft Surface tablet) seems
to fail to report the absence (sic) of TX completions properly.  Work
around this by checking for TX completions only when we expect to see
one.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 9 år sedan
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c6c7e78c42
1 ändrade filer med 4 tillägg och 8 borttagningar
  1. 4
    8
      src/drivers/net/efi/nii.c

+ 4
- 8
src/drivers/net/efi/nii.c Visa fil

@@ -785,12 +785,7 @@ static void nii_poll_tx ( struct net_device *netdev, unsigned int stat ) {
785 785
 		return;
786 786
 
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 	/* Sanity check */
788
-	if ( ! nii->txbuf ) {
789
-		DBGC ( nii, "NII %s reported spurious TX completion\n",
790
-		       nii->dev.name );
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-		netdev_tx_err ( netdev, NULL, -EPIPE );
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-		return;
793
-	}
788
+	assert ( nii->txbuf != NULL );
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 	/* Complete transmission */
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 	iobuf = nii->txbuf;
@@ -888,7 +883,7 @@ static void nii_poll ( struct net_device *netdev ) {
888 883
 	/* Get status */
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 	op = NII_OP ( PXE_OPCODE_GET_STATUS,
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 		      ( PXE_OPFLAGS_GET_INTERRUPT_STATUS |
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-			PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS |
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+			( nii->txbuf ? PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS : 0)|
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 			( nii->media ? PXE_OPFLAGS_GET_MEDIA_STATUS : 0 ) ) );
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 	if ( ( stat = nii_issue_db ( nii, op, &db, sizeof ( db ) ) ) < 0 ) {
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 		rc = -EIO_STAT ( stat );
@@ -898,7 +893,8 @@ static void nii_poll ( struct net_device *netdev ) {
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 	}
899 894
 
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 	/* Process any TX completions */
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-	nii_poll_tx ( netdev, stat );
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+	if ( nii->txbuf )
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+		nii_poll_tx ( netdev, stat );
902 898
 
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 	/* Process any RX completions */
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 	nii_poll_rx ( netdev );

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