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Date: Mon, 18 Aug 1997 01:07:48 -0700 (PDT)
From: shin@sm.sony.co.jp
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: kern/4329: read(2) from /dev/bktr0 hangs
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         4329
>Category:       kern
>Synopsis:       read(2) from /dev/bktr0 hangs
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Aug 18 01:10:00 PDT 1997
>Last-Modified:
>Originator:     Takao Shinohara
>Organization:
Sony corporation
>Release:        2.2.2-RELEASE i386
>Environment:
>Description:
read(2) from Bt848 device (/dev/bktr0) sleeps forever.
>How-To-Repeat:
dd if=/dev/bktr0 of=/dev/null bs=614400 count=1
>Fix:
*** brooktree848.c.~1~  Sun Aug 17 19:20:33 1997
--- brooktree848.c      Mon Aug 18 16:37:05 1997
***************
*** 1132,1141 ****
--- 1132,1158 ----

        bktr->flags &= ~(METEOR_CAP_MASK | METEOR_WANT_MASK);

+ #if 1 /* bugfix */
+       bt848 = bktr->base;
+       start_capture(bktr, METEOR_SINGLE);
+
+       /* wait for capture to complete */
+       bt848->int_stat = ALL_INTS_CLEARED;
+       bt848->gpio_dma_ctl = FIFO_ENABLED;
+       bt848->gpio_dma_ctl = bktr->capcontrol;
+
+       bt848->int_mask = BT848_INT_MYSTERYBIT |
+                       BT848_INT_RISCI      |
+                       BT848_INT_VSYNC      |
+                       BT848_INT_FMTCHG;
+
+       bt848->cap_ctl = bktr->bktr_cap_ctl;
+ #else
        /* Start capture */
        bt848 = bktr->base;
        bt848->gpio_dma_ctl = FIFO_ENABLED;
        bt848->gpio_dma_ctl = FIFO_RISC_ENABLED;
+ #endif

        status = tsleep((caddr_t)bktr, METPRI, "captur", 0);
        if (!status)            /* successful capture */

>Audit-Trail:
>Unformatted: