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[interface] Unplug interface before calling intf_close() in intf_shutdown()

The call to intf_close() may result in the original interface being
reopened.  For example: when reading the capacity of a 2TB+ disk via
iSCSI, the SCSI layer will respond to the intf_close() from the READ
CAPACITY (10) command by immediately issuing a READ CAPACITY (16)
command.  The iSCSI layer happens to reuse the same interface for the
new command (since it allows only a single concurrent command).

Currently, intf_shutdown() unplugs the interface after the call to
intf_close() returns.  In the above scenario, this results in
unplugging the just-reopened interface.

Fix by transferring the interface destination (and its reference) to a
temporary interface, and so effectively performing the unplug before
making the call to intf_close().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 7 anos atrás
pai
commit
f450c75dad
1 arquivos alterados com 9 adições e 4 exclusões
  1. 9
    4
      src/core/interface.c

+ 9
- 4
src/core/interface.c Ver arquivo

@@ -271,6 +271,7 @@ void intf_close ( struct interface *intf, int rc ) {
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  * unplugs the interface.
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  */
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 void intf_shutdown ( struct interface *intf, int rc ) {
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+	struct interface tmp;
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 	DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " shutting down (%s)\n",
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 	       INTF_DBG ( intf ), strerror ( rc ) );
@@ -278,11 +279,15 @@ void intf_shutdown ( struct interface *intf, int rc ) {
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 	/* Block further operations */
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 	intf_nullify ( intf );
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-	/* Notify destination of close */
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-	intf_close ( intf, rc );
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+	/* Transfer destination to temporary interface */
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+	tmp.dest = intf->dest;
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+	intf->dest = &null_intf;
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+
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+	/* Notify destination of close via temporary interface */
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+	intf_close ( &tmp, rc );
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-	/* Unplug interface */
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-	intf_unplug ( intf );
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+	/* Unplug temporary interface */
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+	intf_unplug ( &tmp );
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 }
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 /**

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