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loader: biosdisk should check if the media is present

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The bd_print/bd_open/bd_strategy need to make sure the device does have
media, before getting into performing IO operations. Some systems can
hung if the device without a media is accessed.

Reported by:	yuripv
This commit is contained in:
Toomas Soome 2018-11-02 11:41:58 +00:00
parent b1485f3337
commit 0d0ffe4faa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=340049
1 changed files with 8 additions and 0 deletions
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8
stand/i386/libi386/biosdisk.c
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@ -418,6 +418,9 @@ bd_print(int verbose)
if ((ret = pager_output(line)) != 0)
break;
if ((bdinfo[i].bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)
continue;
dev.dd.d_dev = &biosdisk;
dev.dd.d_unit = i;
dev.d_slice = -1;
@ -464,6 +467,8 @@ bd_open(struct open_file *f, ...)
if ((BD(dev).bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA) {
if (!bd_int13probe(&BD(dev)))
return (EIO);
if ((BD(dev).bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)
return (EIO);
}
BD(dev).bd_open++;
if (BD(dev).bd_bcache == NULL)
@ -569,6 +574,9 @@ bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
caddr_t bbuf;
int rc;
if ((BD(dev).bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)
return (EIO);
/*
* First make sure the IO size is a multiple of 512 bytes. While we do
* process partial reads below, the strategy mechanism is built