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Input: db9 - store object at correct index
The variable i is used to check the port to attach to and we are
supposed to save the reference of struct db9 in the location given by
db9_base[i]. But after finding out the index, i is getting modified again
so we saved in a wrong index.
While at it mark db9_base[i] as NULL after it is freed.
Fixes: 2260c419b5
("Input: db9 - use parallel port device model")
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
parent
92deea1350
commit
dd23bf1044
@ -560,25 +560,25 @@ static void db9_attach(struct parport *pp)
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const struct db9_mode_data *db9_mode;
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struct pardevice *pd;
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struct input_dev *input_dev;
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int i, j;
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int i, j, port_idx;
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int mode;
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struct pardev_cb db9_parport_cb;
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for (i = 0; i < DB9_MAX_PORTS; i++) {
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if (db9_cfg[i].nargs == 0 ||
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db9_cfg[i].args[DB9_ARG_PARPORT] < 0)
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for (port_idx = 0; port_idx < DB9_MAX_PORTS; port_idx++) {
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if (db9_cfg[port_idx].nargs == 0 ||
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db9_cfg[port_idx].args[DB9_ARG_PARPORT] < 0)
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continue;
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if (db9_cfg[i].args[DB9_ARG_PARPORT] == pp->number)
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if (db9_cfg[port_idx].args[DB9_ARG_PARPORT] == pp->number)
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break;
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}
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if (i == DB9_MAX_PORTS) {
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if (port_idx == DB9_MAX_PORTS) {
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pr_debug("Not using parport%d.\n", pp->number);
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return;
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}
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mode = db9_cfg[i].args[DB9_ARG_MODE];
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mode = db9_cfg[port_idx].args[DB9_ARG_MODE];
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if (mode < 1 || mode >= DB9_MAX_PAD || !db9_modes[mode].n_buttons) {
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printk(KERN_ERR "db9.c: Bad device type %d\n", mode);
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@ -594,7 +594,7 @@ static void db9_attach(struct parport *pp)
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db9_parport_cb.flags = PARPORT_FLAG_EXCL;
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pd = parport_register_dev_model(pp, "db9", &db9_parport_cb, i);
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pd = parport_register_dev_model(pp, "db9", &db9_parport_cb, port_idx);
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if (!pd) {
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printk(KERN_ERR "db9.c: parport busy already - lp.o loaded?\n");
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return;
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@ -649,7 +649,7 @@ static void db9_attach(struct parport *pp)
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goto err_free_dev;
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}
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db9_base[i] = db9;
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db9_base[port_idx] = db9;
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return;
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err_free_dev:
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@ -676,6 +676,7 @@ static void db9_detach(struct parport *port)
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return;
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db9 = db9_base[i];
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db9_base[i] = NULL;
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for (i = 0; i < min(db9_modes[db9->mode].n_pads, DB9_MAX_DEVICES); i++)
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input_unregister_device(db9->dev[i]);
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