From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH 1/5] char: lp: introduce list to save port number
Date: Fri, 7 Dec 2018 14:27:30 +0000 [thread overview]
Message-ID: <20181207142734.27370-1-sudipm.mukherjee@gmail.com> (raw)
When we are registering lp in LP_PARPORT_AUTO mode, we are not keeping
any record of the parallel port number to which lp is connecting.
Add an array to save the port number to it.
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
drivers/char/lp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index e0a92d764eee..7e207ff0f2fe 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -141,6 +141,7 @@
static DEFINE_MUTEX(lp_mutex);
static struct lp_struct lp_table[LP_NO];
+static int port_num[LP_NO];
static unsigned int lp_count = 0;
static struct class *lp_class;
@@ -938,6 +939,7 @@ static int lp_register(int nr, struct parport *port)
CONSOLE_LP, port->name);
}
#endif
+ port_num[nr] = port->number;
return 0;
}
@@ -1013,6 +1015,7 @@ static int __init lp_init(void)
init_waitqueue_head(&lp_table[i].dataq);
mutex_init(&lp_table[i].port_mutex);
lp_table[i].timeout = 10 * HZ;
+ port_num[i] = -1;
}
if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
@@ -1091,6 +1094,7 @@ static void lp_cleanup_module(void)
for (offset = 0; offset < LP_NO; offset++) {
if (lp_table[offset].dev == NULL)
continue;
+ port_num[offset] = -1;
parport_unregister_device(lp_table[offset].dev);
device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
}
--
2.11.0
next reply other threads:[~2018-12-07 14:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-07 14:27 Sudip Mukherjee [this message]
2018-12-07 14:27 ` [PATCH 2/5] char: lp: detach the device when parallel port is removed Sudip Mukherjee
2018-12-07 14:27 ` [PATCH 3/5] char: lp: use first unused lp number while registering Sudip Mukherjee
2018-12-07 14:27 ` [PATCH 4/5] char: lp: properly count the lp devices Sudip Mukherjee
2018-12-07 14:27 ` [PATCH 5/5] char: lp: use new parport device model Sudip Mukherjee
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