diff --git a/ChangeLog b/ChangeLog
index d1c49cf0c..1d1bd6cb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2003-02-17  Henning Meier-Geinitz <henning@meier-geinitz.de>
+
+	* backend/mustek.c doc/descriptions/mustek.desc
+	  doc/mustek/mustek.CHANGES: Make sure that the result of the
+	  reader_process is interpreted correctly. Block signals when waiting
+	  for a SCSI request to finish. Otherwise we may get a segfault if the
+	  reader_process is terminated while waiting.
+
 2003-02-16  Henning Meier-Geinitz <henning@meier-geinitz.de>
 
 	* doc/doxygen-sanei.conf: Updated version.
diff --git a/backend/mustek.c b/backend/mustek.c
index ec49fc202..c8efd18d2 100644
--- a/backend/mustek.c
+++ b/backend/mustek.c
@@ -46,7 +46,7 @@
 
 /**************************************************************************/
 /* Mustek backend version                                                 */
-#define BUILD 130
+#define BUILD 131
 /**************************************************************************/
 
 #include "../include/sane/config.h"
@@ -2843,17 +2843,31 @@ do_stop (Mustek_Scanner * s)
       /* ensure child knows it's time to stop: */
       DBG (5, "do_stop: terminating reader process\n");
       kill (s->reader_pid, SIGTERM);
+
       pid = waitpid (s->reader_pid, &exit_status, 0);
+      if (pid < 0)
+	{
+	  DBG (1, "do_stop: waitpid failed, already terminated? (%s)\n",
+	       strerror (errno));
+	}
+      else if (WIFEXITED (exit_status))
+	{
+	  DBG (2, "do_stop: reader process terminated with status %s\n",
+	       sane_strstatus (WEXITSTATUS (exit_status)));
+	  if (status != SANE_STATUS_CANCELLED 
+	      && WEXITSTATUS (exit_status) != SANE_STATUS_GOOD)
+	    status = WEXITSTATUS (exit_status);
+	}
+      else if (WIFSIGNALED (status))
+	{
+	  DBG (2, "do_stop: reader process was terminated by signal %d\n",
+	       WTERMSIG (exit_status));
+	  if (WTERMSIG (exit_status) != 15)
+	    status = SANE_STATUS_IO_ERROR;
+	}
+      else
+	DBG (1, "do_stop: reader process terminated by unknown reason\n");
 
-      if (status != SANE_STATUS_CANCELLED && pid > 0
-	  && WIFEXITED (exit_status))
-	status = WEXITSTATUS (exit_status);
-
-      DBG (5, "do_stop: reader process terminated: %s\n",
-	   sane_strstatus (status));
-      if (pid <= 0)
-	DBG (5, "do_stop: reader process already terminated (%s)\n",
-	     strerror (errno));
       s->reader_pid = 0;
     }
 
@@ -4839,7 +4853,9 @@ reader_process (Mustek_Scanner * s, SANE_Int fd)
 	    {
 	      DBG (4, "reader_process: buffer %d: waiting for request to be "
 		   "ready\n", buffernumber + 1);
+	      sigprocmask (SIG_BLOCK, &sigterm_set, 0);
 	      status = dev_req_wait (bstat[buffernumber].id);
+	      sigprocmask (SIG_UNBLOCK, &sigterm_set, 0);
 	      if (status == SANE_STATUS_GOOD)
 		{
 		  DBG (4, "reader_process: buffer %d is ready, wanted %d, "
diff --git a/doc/descriptions/mustek.desc b/doc/descriptions/mustek.desc
index 5bfc6dd53..495ecbacc 100644
--- a/doc/descriptions/mustek.desc
+++ b/doc/descriptions/mustek.desc
@@ -9,7 +9,7 @@
 ;
 
 :backend "mustek"		; name of backend
-:version "1.0-130"		; version of backend
+:version "1.0-131"		; version of backend
 :status :stable			; :alpha, :beta, :stable, :new
 :manpage "sane-mustek"		; name of manpage (if it exists)
 :url "http://www.meier-geinitz.de/sane/mustek-backend/"
diff --git a/doc/mustek/mustek.CHANGES b/doc/mustek/mustek.CHANGES
index a709c4c4a..f879ce303 100644
--- a/doc/mustek/mustek.CHANGES
+++ b/doc/mustek/mustek.CHANGES
@@ -1,5 +1,13 @@
 CHANGES for the SANE Mustek backend
 
+2003-02-17
+  * Released Mustek backend 1.0-131
+
+2003-02-17
+  * Make sure that the result of the reader_process is interpreted correctly.
+  * Block signals when waiting for a SCSI request to finish. Otherwise we may
+    get a segfault if the reader_process is terminated while waiting.
+
 2002-11-29
   * Released Mustek backend 1.0-130